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Clin Oral Investig. 2013 Jan;17(1):139-46. doi: 10.1007/s00784-012-0680-x. Epub 2012 Jan 27.

The color change in artificial white spot lesions measured using a spectroradiometer.

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1
Department of Conservative Dentistry and Dental Research Institute, School of Dentistry, Seoul National University, Seoul, South Korea.

Abstract

OBJECTIVES:

The purpose of this study was to determine the color of white spot lesions.

MATERIALS AND METHODS:

Human premolars were subjected to a pH cycling to produce artificial caries lesions and classified into groups (n = 10/group): group 1, immersion in deionized water; group 2, pH cycling without fluoride (F) application; group 3, pH cycling with immersion in 1,000 ppm NaF solution; and group 4, pH cycling with immersion in 5,000 ppm NaF solution. CIE L*a*b* color parameters of the tooth were determined using a spectroradiometer at baseline, after demineralization and after pH cycling. The extent of demineralization was evaluated by scanning electron microscopy (SEM) and electron microprobe analysis (EPMA).

RESULTS:

Significant degrees of color change (ΔE*) were observed after demineralization (p < 0.05). The changes were mainly due to an increase in lightness (L*) and a decrease in yellowness (b*). F application induced a significantly large ΔE* in group 4 (p < 0.05). The color reversal after remineralization was mostly due to the recovery of L*. SEM and EPMA verified that net mineral gains occurred in the subsurface lesions.

CONCLUSIONS:

The initially white appearance of enamel caries was a result of changes of L* and b*. F treatment partially restored the color of white spot lesions.

CLINICAL RELEVANCE:

F-driven remineralization induced both mineral gains and esthetic enhancement of artificially produced enamel white spot lesions. The increase of L* and the decrease of b* contributed to the color changes.

PMID:
22278014
DOI:
10.1007/s00784-012-0680-x
[Indexed for MEDLINE]
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